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WO2024079107A1 - Method for coating, by electrostatic spraying, a metal surface or substrate intended to receive an elastomer, and associated kit and tool - Google Patents

Method for coating, by electrostatic spraying, a metal surface or substrate intended to receive an elastomer, and associated kit and tool Download PDF

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Publication number
WO2024079107A1
WO2024079107A1 PCT/EP2023/078029 EP2023078029W WO2024079107A1 WO 2024079107 A1 WO2024079107 A1 WO 2024079107A1 EP 2023078029 W EP2023078029 W EP 2023078029W WO 2024079107 A1 WO2024079107 A1 WO 2024079107A1
Authority
WO
WIPO (PCT)
Prior art keywords
composition
fep
peek
polyetheretherketone
mixture
Prior art date
Application number
PCT/EP2023/078029
Other languages
French (fr)
Inventor
Benjamin Morin
Original Assignee
Fluorotechnique
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fluorotechnique filed Critical Fluorotechnique
Publication of WO2024079107A1 publication Critical patent/WO2024079107A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0263—After-treatment with IR heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0272—After-treatment with ovens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/58—Applying the releasing agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/30—Change of the surface
    • B05D2350/33—Roughening
    • B05D2350/38—Roughening by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2506/00—Halogenated polymers
    • B05D2506/10—Fluorinated polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2650/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G2650/28—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type
    • C08G2650/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group
    • C08G2650/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group containing ketone groups, e.g. polyarylethylketones, PEEK or PEK

Definitions

  • the invention relates to the field of coatings with fluoropolymers of substrates or metal surfaces intended to receive an elastomer such as, for example, tire rubber.
  • the invention relates to a process for coating tire molds.
  • the state of the art includes, for example, application W081/001375 A1, which discloses a composite material which comprises a protective outer layer deposited by sintering and consisting of polytetrafluoroethylene (PTFE) particles dispersed in a polyimide lacquer.
  • the composition includes 90 to 80% by volume of thermosetting polyimide lacquer and 10 to 20% by volume of self-lubricating additives such as PTFE.
  • a known solution is to use Xylan® 8840 as a coating.
  • molds comprising such a coating are quickly damaged and their mechanical properties decrease so that the anti-adhesion and sliding functions fade.
  • Reprocessing of these coatings is also known but can only be done three to four times after which the molds are no longer reusable. These reprocessings consist of pyrolizing the molds, then sandblasting them and reapplying the coating with Xylan® 8840. These reprocessings are not satisfactory in particular because they involve energy expenditure and deterioration of the molds.
  • Xylan® 8840 is not satisfactory because it does not provide a sufficiently thin layer (30 to 50 ⁇ m with Xylan 8840) of coating which retains satisfactory mechanical resistance properties. Indeed, due to the countersinking of these molds, it is preferable that the coatings applied are as thin as possible while having sufficient mechanical strength so as not to be damaged during demoulding operations. The use of a thin coating is of interest in the manufacture of tires with fine grooves.
  • the invention aims to remedy the drawbacks of the state of the art and in particular to propose an improved coating process.
  • the invention proposes a process for coating a substrate or a suitable metal surface intended to subsequently receive an elastomer such as tire rubber by electrostatic projection, said process being characterized in that it comprises the following steps: a) the preparation of a composition A comprising at least one fluoroethylenepropylene (FEP) in the form of a micropowder having a particle size of between 1 and 7 ⁇ m; b) the preparation of a composition B comprising at least one polyetheretherketone (PEEK) in the form of a micropowder having a particle size of between 2pm and 50pm; c) mix the two compositions A and B thoroughly so as to form a composition AB in the form of a fine powder; d) apply by electrostatic projection the AB mixture obtained in step c) on the substrate or the metal surface; e) polymerization of said composition.
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • said substrate or said metal surface intended to receive an elastomer is made of steel.
  • micro-powder composition also called composition or mixture A-B
  • composition or mixture A-B comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK)
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • the projection of a micro-powder is very advantageous compared to a liquid product because it allows parts of complex geometries to be uniformly treated.
  • the application of the mixture of micro-powders creates a whitish effect on the part before polymerization, ensuring good application over the entire desired surface. This has the first advantage of not creating excess thickness and also of saving on coating.
  • micro-powders are currently not subject to European REACH legislation regarding solvents in products since they are used without solvents, and preferably pure.
  • suitable metal surface or substrate is meant a surface sufficiently resistant to treatments linked to the application and polymerization of the micro-powder composition comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK).
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • the high baking temperatures used to polymerize the mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), do not deteriorate such a surface.
  • a metallic substrate or having a metallic surface adapted to withstand said cooking temperatures such as 400°C or even 380°C, which may, among other things, be intended to subsequently receive an elastomer such as tire rubber.
  • Coating refers to a layer of material, preferably solid, totally or partially covering a surface in order to protect and/or provide particular physico-chemical properties to said surface.
  • “Surface” or “Substrate” refers to the visible part of a material on which the deposit of the micro-powder composition A-B (comprising the mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK)) can be placed. artwork.
  • substrates include a material used: in the field of aeronautics (airplane, helicopter, for example), in the railway field, in the automotive field, in the nautical and naval field; in the field of wind power; in passenger spaces (planes, buses, metro, for example); or in the building sector (exterior or interior surfaces).
  • electrostatic projection we mean any means making it possible to project, spray or transfer a micro-powder onto a substrate and to hold it in place by means of electrostatic charges.
  • electrostatic gun an electrostatic fluidized bath, an electrostatic fluidized bed or any technically equivalent means known to those skilled in the art can be used.
  • said micro-powder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), preferably between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of FEP relative to the total weight of said composition and between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70% , preferably between 40% and 60% by weight of PEEK relative to the total weight of said composition.
  • said micro-powder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) in a 50/50 proportion by weight relative to the total weight of said composition.
  • the FEP/PEEK mixture has the following advantages over state-of-the-art coatings: anti-adhesion, anti-friction, chemical inertia, electrical insulation, thermal resistance and thin.
  • Said FEP fluoropolymer has a particle size of between approximately 1 and 7 pm, preferably 4 pm.
  • the fine PEEK polyetheretherketone particles have a particle size of between approximately 2pm and 50pm.
  • step d) of applying said composition is carried out by electrostatic spraying or electrostatic spraying. That is to say that the application means, such as an electrostatic gun, is adapted to spray on the surface of said substrate or of said surface, said composition of the invention.
  • the application means such as an electrostatic gun
  • a WAGNER® electrostatic gun can be used as an application means.
  • step d) of applying said composition is carried out by using an electrostatic fluidized bath.
  • said micro-powder of FEP or PEEK used is obtained by evaporation of the aqueous phase solution of FEP or liquid PEEK, then crushed and/or sieved or by micro-grinding of a powder in order to obtain the usable particle size.
  • polymerization step e) is carried out at a temperature between approximately 360°C and 420°C, preferably approximately 380°C, until total polymerization of said fluoroethylenepropylene (FEP) mixture and polyetheretherketone (PEEK), i.e. preferably for 1 hour.
  • the method according to the invention may comprise preliminary preparation steps in step a), such as a thermal penetrant step and/or a sparing step and/or a sandblasting step, at least partially , of the surface to be coated.
  • the method comprises, prior to step a), a sandblasting step and/or a degreasing step, at least partially, of the metal surface to be coated.
  • the invention also relates to a kit for coating with a mixture of at least one fluoropolymer and a polyetheretherketone (PEEK) of a substrate or a suitable metal surface intended to receive an elastomer such as tire rubber.
  • a kit for coating with a mixture of at least one fluoropolymer and a polyetheretherketone (PEEK) of a substrate or a suitable metal surface intended to receive an elastomer such as tire rubber configured for the implementation of a process as described above, comprising: a micro-powder composition (50) comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), a means of applying said composition by electrostatic projection (60) onto said surface, preferably a means of polymerization (70) of said composition.
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • the invention also relates to a substrate or a metal surface, comprising a surface coated with a micro-powder composition (50) comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), obtained by the process defined below. -above and intended to receive an elastomer.
  • a micro-powder composition comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), obtained by the process defined below. -above and intended to receive an elastomer.
  • the invention relates to a composition, preferably in the form of micropowder, suitable for carrying out the process according to the invention. That is to say a homogeneous micro-powder composition comprising at least fluoroethylene propylene (FEP) and polyetheretherketone (PEEK), more particularly a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), preferably in a proportion between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of FEP relative to the total weight of said composition and between 10% and 90% %, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of PEEK relative to the total weight of said composition.
  • FEP fluoroethylene propylene
  • PEEK polyetheretherketone
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • the subject of the present application also relates to the use of such a composition, preferably comprising at least fluoroethylenepropylene (FER) and polyetheretherketone (PEEK) in micro-powder form as a coating in order to obtain a surface having anti-adhesion, anti-friction, chemical inertia, electrical insulation, thermal and/or slip resistance properties.
  • FER fluoroethylenepropylene
  • PEEK polyetheretherketone
  • Another object of the invention consists of a mechanical tool comprising a suitable metallic surface coated with the composition A-B comprising the mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) obtained by the process as described above and intended to receive an elastomer such as tire rubber.
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • the invention also relates to mechanical tooling comprising a suitable metallic surface coated with a mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) and intended to receive an elastomer such as tire rubber, comprising the following characteristics together or separately: a single layer of the mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) is applied; the layer of the mixture of micro-powders of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) applied to a thickness of between 3 pm and 20 pm, preferably between 5 pm and 15 pm, preferably around 10 p.m.
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • the mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) is a composition of micro-powders comprising between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, of preferably between 40% and 60% by weight of fluoroethylenepropylene (FEP) relative to the total weight of said composition and between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of polyetheretherketone (PEEK) relative to the total weight of said composition.
  • said micropowder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) in a 50/50 proportion by weight relative to the total weight of said composition.
  • Such a tool can be a tire mold or a tool intended to come into contact with an elastomer such as for example a tool for cutting an elastomer.
  • Figure 1 illustrates a method according to a variant of the invention describing steps 10 to 80. Other characteristics, details and advantages of the invention will emerge on reading the description which follows, with reference to Figure 1.
  • the process preferably begins with a step (10) of thermal penetrating the part to be treated according to means known to those skilled in the art under operating conditions which do not degrade the substrate.
  • This thermal penetrant step makes it possible to eliminate impurities which could be found on the part to be treated and hinder the adhesion of the coating according to the invention.
  • a sandblasting step (30) can be carried out in order to prepare the surface of the substrate.
  • Sandblasting is carried out by any appropriate means and in particular by an electro-fused crystallized aluminum oxide of very high purity, obtained by melting calcined aluminum oxide; such as for example using grade 80 white corundum.
  • the sandblasting pressure is adjusted according to the substrate so as to avoid damaging it, for example between approximately 2 to 3 bars. For a metal substrate, a pressure of 3 bars is preferred.
  • One or more passes of the sandblasting means can be implemented according to the operator's wishes depending on the nature of the substrate and the desired result.
  • a cleaning step (40) can be carried out for example by blowing compressed air onto the appropriate surfaces, in order to remove residues of corundum and/or materials detached from the substrate.
  • a saving step (20) can then be implemented before and/or after the sandblasting step (30) in order to delimit the zone of sandblasting and/or application of the composition according to the invention on the surface of the substrate.
  • the saving can be mechanical or manual according to means known to those skilled in the art such as affixing a mask to surface parts that one does not wish to treat, for example using tape. sandblasting. In particular, areas that should not be coated are protected by such savings.
  • step (60) of applying the composition according to the invention by electrostatic spraying is carried out using an electrostatic gun, at a rate of approximately 50g/m2 to 150 g/m2, preferably approximately 100 g/m2.
  • micro-powder composition according to the invention will have been previously prepared during step (50) in Figure 1, by mixing micro-powders of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) obtained by grinding then sieving the dry material obtained after evaporation of FEP and liquid PEEK or by micro-grinding of the powders in order to obtain the desired particle size.
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • micro-powders can be purchased commercially or manufactured on site. However, the applicant has noted that it is very difficult to find commercially micro-powders having the characteristic, in particular the particle size, suitable for the present invention. It therefore appears preferable to produce them yourself according to the protocol described in this application.
  • Said mixture of FEP and PEEK micro-powders is produced in the following proportions: between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% in weight of FEP relative to the total weight of said composition and between 10% and 90%, preferably between 20% and 80%, again more preferably between 30 and 70%, preferably between 40% and 60% by weight of PEEK relative to the total weight of said composition.
  • said micropowder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) in a 50/50 proportion by weight relative to the total weight of said composition.
  • FEP fluoroethylenepropylene
  • PEEK polyetheretherketone
  • composition according to the invention may comprise other compounds provided that they do not oppose the application and the polymerization of the composition according to the invention.
  • dyes such as graphite, and/or lubricating agents, and/or hardening agents.
  • a polymerization step (70) is carried out at a temperature adapted to the substrate generally between approximately 360°C and 420°C, preferably preferably between 360°C and 385°C, more preferably at approximately 380°C, for 30 to 90 minutes, preferably between 45 and 60 minutes; preferably approximately 1 hour, according to means known to those skilled in the art such as for example using an oven or infrared radiation. This cooking makes it possible to form a layer which adheres to all or part of the metal surface.
  • the substrate thus coated is subsequently cooled, for example until reaching ambient temperature, then quality controls (80) can be carried out.
  • Said checks may consist of dimensional readings preferably at several points of the surface thus coated. These readings are carried out, for example, using a permascope. It is thus possible to ensure the thickness of the coating and its uniformity. We can also check if there are blisters or traces of oxidation.
  • a grid test on a tracer specimen can be carried out.
  • the method according to a variant of the invention preferably begins with a step (30) of sandblasting the part to be treated, optionally preceded by a saving step (20).
  • a cleaning step (40) is preferably carried out, for example by blowing compressed air onto the appropriate surfaces, in order to remove corundum and/or metal residues.
  • the sandblasting (30) and/or cleaning (40) steps can be carried out under the control, for example visually, of an operator.
  • the coating according to the invention is generally transparent but compounds can be added to modify the color.
  • the micro-powder composition comprises a mixture of 75% fluoroethylenepropylene (FEP) (compound A) and 25% polytetrafluoroethylene (PTFE) (compound B), hereinafter referred to as DELTAFLON, did not provide good adhesion on the metal according to the grid test carried out on the substrate according to the International Standard ISO 2409:2007 well known to those skilled in the art.
  • FEP fluoroethylenepropylene
  • PTFE polytetrafluoroethylene
  • Example 1 The unsuccessful tests described in Example 1 led the inventors to seek solutions to resolve the technical problem. These solutions consisted of modifying the following steps:
  • the tests are measured using the grid test as described in the International Standard ISO 2409:2007, well known to those skilled in the art.
  • This International Standard describes a test method for evaluating the resistance of paint coatings to being separated from their substrates when a grid is made in the coating by incisions down to the substrate.
  • the property evaluated by this empirical method depends, among other things, on the adhesion of the layer either to the previous layer or to the substrate.
  • the equipment required for these measurements may be a single blade cutting tool which is suitable for all types of coatings applied to hard or soft surfaces.
  • a tool with several blades can also be used but is not suitable for thick (> 120 pm) or hard coatings, nor for coatings applied to soft substrates.
  • the micropowder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), preferably between 70 to 90% by weight of FEP and 10% to 30% by weight of PEEK.

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Abstract

Method for coating, by electrostatic spraying, a metal surface or substrate that is intended to receive an elastomer, comprising at least the following steps: • a) preparing a composition A comprising at least one fluoroethylene-propylene (FEP) in the form of a micro-powder having a particle size of between 1 and 7 μm; • b) preparing a composition B comprising at least one polyether ether ketone (PEEK) in the form of a micro-powder having a particle size of between 2 μm and 50 μm; • c) intimately mixing the 2 compositions A and B so as to form a composition A-B (50) in the form of a fine powder; • d) applying, by electrostatic spraying (60), the mixture A-B obtained in step c) onto the metal surface or substrate; • e) polymerizing (70) said composition A-B.

Description

Procédé de revêtement d'un substrat ou d'une surface métallique destinée à recevoir un élastomère par projection électrostatique, kit et outil associés Process for coating a substrate or a metal surface intended to receive an elastomer by electrostatic projection, associated kit and tool

Domaine technique Technical area

L'invention se rapporte au domaine des revêtements par des fluoropolymères de substrats ou de surfaces métalliques destinés à recevoir un élastomère tel que par exemple une gomme de pneu. En particulier, l'invention se rapporte à un procédé de revêtement de moules de pneus. The invention relates to the field of coatings with fluoropolymers of substrates or metal surfaces intended to receive an elastomer such as, for example, tire rubber. In particular, the invention relates to a process for coating tire molds.

État de l'art antérieur State of the prior art

Dans ce domaine, il est connu d'appliquer un revêtement de fluoropolymères, notamment sur des moules pour pneus, afin d'avoir une surface ayant des propriétés d'anti-adhérence et de glissement lors de la fabrication des pneus. Ainsi lors de la vulcanisation de la gomme, il est plus facile de séparer la gomme de la surface métallique du moule. In this field, it is known to apply a fluoropolymer coating, in particular to tire molds, in order to have a surface having anti-adhesion and sliding properties during the manufacture of tires. Thus when the rubber is vulcanized, it is easier to separate the rubber from the metal surface of the mold.

L'état de la technique comprend par exemple la demande W081/001375 Al, qui divulgue un matériau composite qui comprend une couche extérieure protectrice déposée par frittage et constituée de particules de polytétrafluoroéthylène (PTFE) dispersées dans une laque de polyimide. La composition comprend de 90 à 80% en volume de laque de polyimide thermo-durcissable et de 10 à 20% en volume d'additifs auto-lubrifiants tels que du PTFE. The state of the art includes, for example, application W081/001375 A1, which discloses a composite material which comprises a protective outer layer deposited by sintering and consisting of polytetrafluoroethylene (PTFE) particles dispersed in a polyimide lacquer. The composition includes 90 to 80% by volume of thermosetting polyimide lacquer and 10 to 20% by volume of self-lubricating additives such as PTFE.

Une solution connue consiste à utiliser du Xylan® 8840 comme revêtement. Cependant, les moules comprenant un tel revêtement s'endommagent rapidement et leurs propriétés mécaniques diminuent de sorte que les fonctions d'anti-adhérence et de glissement s'estompent. Des retraitements de ces revêtements sont également connus mais ils ne peuvent se faire que trois à quatre fois après quoi les moules ne sont plus réutilisables. Ces retraitements consistent à pyroliser les moules, puis à les sabler et appliquer de nouveau le revêtement au Xylan® 8840. Ces retraitements ne sont pas satisfaisants notamment parce qu'ils induisent des dépenses d'énergies et une détérioration des moules. En outre pour certaines applications, le Xylan® 8840 n'est pas satisfaisant car il ne permet pas d'avoir une couche suffisamment fine (30 à 50 pm avec du Xylan 8840) de revêtement qui conserve des propriétés de résistance mécanique satisfaisante. En effet, en raison du lamage de ces moules, il est préférable que les revêtements appliqués soient aussi fins que possible tout en ayant une résistance mécanique suffisante pour ne pas être détériorés lors des opérations de démoulage. L'utilisation d'un revêtement fin trouve un intérêt dans la fabrication de pneus ayant des sillons fins. A known solution is to use Xylan® 8840 as a coating. However, molds comprising such a coating are quickly damaged and their mechanical properties decrease so that the anti-adhesion and sliding functions fade. Reprocessing of these coatings is also known but can only be done three to four times after which the molds are no longer reusable. These reprocessings consist of pyrolizing the molds, then sandblasting them and reapplying the coating with Xylan® 8840. These reprocessings are not satisfactory in particular because they involve energy expenditure and deterioration of the molds. Furthermore, for certain applications, Xylan® 8840 is not satisfactory because it does not provide a sufficiently thin layer (30 to 50 μm with Xylan 8840) of coating which retains satisfactory mechanical resistance properties. Indeed, due to the countersinking of these molds, it is preferable that the coatings applied are as thin as possible while having sufficient mechanical strength so as not to be damaged during demoulding operations. The use of a thin coating is of interest in the manufacture of tires with fine grooves.

Pour des substrats ayant une géométrie complexe, il est difficile d'obtenir un revêtement uniforme et très mince inférieur à 20 pm, de préférence de l'ordre de 5 à 10 pm lorsque des fluoropolymères sous forme liquide sont utilisés. De même, il n'est pas aisé de visualiser cette application en particulier si la composition liquide, comprenant au moins un fluoropolymère, est transparente. For substrates having a complex geometry, it is difficult to obtain a uniform and very thin coating of less than 20 μm, preferably of the order of 5 to 10 μm when fluoropolymers in liquid form are used. Likewise, it is not easy to visualize this application in particular if the liquid composition, comprising at least one fluoropolymer, is transparent.

Exposé de l'invention Presentation of the invention

L'invention vise à remédier aux inconvénients de l'état de la technique et notamment à proposer un procédé amélioré de revêtement. The invention aims to remedy the drawbacks of the state of the art and in particular to propose an improved coating process.

Pour ce faire l'invention propose un procédé de revêtement d'un substrat ou d'une surface métallique approprié destiné à recevoir ultérieurement un élastomère tel qu'une gomme de pneu par projection électrostatique, ledit procédé étant caractérisé en ce qu'il comprend les étapes suivantes : a) la préparation d'une composition A comprenant au moins un fluoroéthylènepropylène (FEP) sous forme de micro-poudre présentant une granulométrie comprise entre 1 et 7 pm ; b) la préparation d'une composition B comprenant au moins un polyétheréthercétone (PEEK) sous forme de micro-poudre présentant une granulométrie comprise entre 2pm et 50pm ; c) mélanger intimement les 2 compositions A et B de manière à former une composition A-B sous forme de poudre fine ; d) appliquer par projection électrostatique le mélange A-B obtenu à l'étape c) sur le substrat ou la surface métallique ; e) polymérisation de ladite composition. To do this, the invention proposes a process for coating a substrate or a suitable metal surface intended to subsequently receive an elastomer such as tire rubber by electrostatic projection, said process being characterized in that it comprises the following steps: a) the preparation of a composition A comprising at least one fluoroethylenepropylene (FEP) in the form of a micropowder having a particle size of between 1 and 7 μm; b) the preparation of a composition B comprising at least one polyetheretherketone (PEEK) in the form of a micropowder having a particle size of between 2pm and 50pm; c) mix the two compositions A and B thoroughly so as to form a composition AB in the form of a fine powder; d) apply by electrostatic projection the AB mixture obtained in step c) on the substrate or the metal surface; e) polymerization of said composition.

De manière avantageuse, ledit substrat ou ladite surface métallique destiné à recevoir un élastomère est en acier. Advantageously, said substrate or said metal surface intended to receive an elastomer is made of steel.

La composition de micro-poudre (dénommé également composition ou mélange A-B) comprenant un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) permet de palier les inconvénients de l'art antérieur en termes de glissement et d'effet antiadhésif mais également en termes de résistance mécanique et de finesse du revêtement, tout en facilitant l'application de ladite composition sur le substrat. Elle permet également un nettoyage plus aisé des moules et ainsi de préserver la durée de vie des moules utilisés. The micro-powder composition (also called composition or mixture A-B) comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) makes it possible to overcome the disadvantages of the prior art in terms of sliding and non-stick effect but also in terms of mechanical resistance and fineness of the coating, while facilitating the application of said composition to the substrate. It also allows easier cleaning of the molds and thus preserves the lifespan of the molds used.

En effet, la projection d'une micro-poudre est très avantageuse par rapport à un produit liquide car elle permet de traiter uniformément des pièces de géométries complexes. De plus, l'application du mélange de micro-poudres crée un effet blanchâtre sur la pièce avant polymérisation, permettant de s'assurer de la bonne application sur la totalité de la surface souhaitée. Ceci ayant comme 1er avantage de ne pas créer de surépaisseurs et également de faire des économies de revêtement. In fact, the projection of a micro-powder is very advantageous compared to a liquid product because it allows parts of complex geometries to be uniformly treated. In addition, the application of the mixture of micro-powders creates a whitish effect on the part before polymerization, ensuring good application over the entire desired surface. This has the first advantage of not creating excess thickness and also of saving on coating.

En outre, ces micro-poudres ne sont actuellement pas soumises à la législation européenne REACH concernant les solvants dans les produits puisqu'elles sont utilisées sans solvants, et préférentiellement pures. In addition, these micro-powders are currently not subject to European REACH legislation regarding solvents in products since they are used without solvents, and preferably pure.

Par « surface ou substrat métallique approprié », on entend une surface suffisamment résistante aux traitements liés à l'application et à la polymérisation de la composition de micro-poudre comprenant un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK). By “suitable metal surface or substrate” is meant a surface sufficiently resistant to treatments linked to the application and polymerization of the micro-powder composition comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK).

En particulier, les températures de cuisson élevées, utilisées pour polymériser le mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK), ne détériorent pas une telle surface. A titre d'exemple un substrat métallique ou ayant une surface métallique adapté pour supporter lesdites températures de cuisson telles que 400°C ou encore 380°C, pouvant entre autres être destiné à recevoir ultérieurement un élastomère tel qu'une gomme de pneu. In particular, the high baking temperatures, used to polymerize the mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), do not deteriorate such a surface. By way of example, a metallic substrate or having a metallic surface adapted to withstand said cooking temperatures such as 400°C or even 380°C, which may, among other things, be intended to subsequently receive an elastomer such as tire rubber.

« Revêtement » : fait référence à une couche de matière, de préférence solide, recouvrant totalement ou partiellement, une surface afin de protéger et/ou d'apporter des propriétés physico -chimiques particulières à ladite surface. “Coating”: refers to a layer of material, preferably solid, totally or partially covering a surface in order to protect and/or provide particular physico-chemical properties to said surface.

« Surface » ou « Substrat » : fait référence à la partie apparente d'un matériau sur laquelle le dépôt de la composition de micro-poudre A-B (comprenant le mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK)) peut être mis en œuvre. Des exemples non limitatifs de substrats comprennent un matériau utilisé : dans le domaine de l'aéronautique (avion, hélicoptère, par exemple), dans le domaine du ferroviaire, dans le domaine automobile, dans le domaine nautique et naval ; dans le domaine de l'éolien ; dans les espaces passagers (avions, bus, métro, par exemple) ; ou dans le domaine du bâtiment (surfaces extérieures ou intérieures). “Surface” or “Substrate”: refers to the visible part of a material on which the deposit of the micro-powder composition A-B (comprising the mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK)) can be placed. artwork. Non-limiting examples of substrates include a material used: in the field of aeronautics (airplane, helicopter, for example), in the railway field, in the automotive field, in the nautical and naval field; in the field of wind power; in passenger spaces (planes, buses, metro, for example); or in the building sector (exterior or interior surfaces).

Par « projection électrostatique », on entend tous moyens permettant de projeter, pulvériser ou transférer, une micro-poudre sur un substrat et de la maintenir en place par l'intermédiaire de charges électrostatiques. Pour ce faire, on peut utiliser un pistolet électrostatique, un bain fluidisé électrostatique, un lit fluidisé électrostatique ou tout moyen techniquement équivalent, connu de l'homme du métier. By “electrostatic projection” we mean any means making it possible to project, spray or transfer a micro-powder onto a substrate and to hold it in place by means of electrostatic charges. To do this, an electrostatic gun, an electrostatic fluidized bath, an electrostatic fluidized bed or any technically equivalent means known to those skilled in the art can be used.

Selon une autre caractéristique de l'invention, ladite composition de micro-poudres comprend un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK), de préférence entre 10% et 90%, préférentiellement entre 20% et 80%, encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de FEP par rapport au poids totale de ladite composition et entre 10% et 90%, préférentiellement entre 20% et 80% , encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de PEEK par rapport au poids totale de ladite composition. Selon un autre mode de réalisation ladite composition de micro-poudres comprend un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) en proportion à 50/50 en poids par rapport au poids totale de ladite composition. According to another characteristic of the invention, said micro-powder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), preferably between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of FEP relative to the total weight of said composition and between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70% , preferably between 40% and 60% by weight of PEEK relative to the total weight of said composition. According to another embodiment, said micro-powder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) in a 50/50 proportion by weight relative to the total weight of said composition.

Le demandeur a découvert, de manière surprenante, que le mélange FEP/PEEK comporte les avantages suivants vis-à-vis des revêtements de l'état de l'art : anti-adhérence, antifrottement, inertie chimique, isolation électrique, résistance thermique et faible épaisseur. The applicant has discovered, surprisingly, that the FEP/PEEK mixture has the following advantages over state-of-the-art coatings: anti-adhesion, anti-friction, chemical inertia, electrical insulation, thermal resistance and thin.

Ledit fluoropolymère FEP présente une granulométrie comprise entre environ 1 et 7 pm, de préférence 4 pm. Said FEP fluoropolymer has a particle size of between approximately 1 and 7 pm, preferably 4 pm.

Les particules fines de polyétheréthercétone PEEK présentent une granulométrie comprise entre environ 2pm et 50pm. The fine PEEK polyetheretherketone particles have a particle size of between approximately 2pm and 50pm.

Selon une autre caractéristique de l'invention, l'étape d) d'application de ladite composition est effectuée par pistolage électrostatique ou pulvérisation électrostatique. C'est-à-dire que le moyen d'application, tel qu'un pistolet électrostatique, est adapté à pulvériser sur la surface dudit substrat ou de ladite surface, ladite composition de l'invention. A titre d'exemple, un pistolet électrostatique WAGNER® peut être utilisé comme moyen d'application. According to another characteristic of the invention, step d) of applying said composition is carried out by electrostatic spraying or electrostatic spraying. That is to say that the application means, such as an electrostatic gun, is adapted to spray on the surface of said substrate or of said surface, said composition of the invention. For example, a WAGNER® electrostatic gun can be used as an application means.

Selon un autre mode de réalisation, l'étape d) d'application de ladite composition est effectuée par l'utilisation d'un bain fluidisé électrostatique. According to another embodiment, step d) of applying said composition is carried out by using an electrostatic fluidized bath.

De préférence, ladite micro-poudre de FEP ou de PEEK utilisée est obtenue par évaporation de la solution en phase aqueuse du FEP ou du PEEK liquide, puis broyée et/ou tamisée ou par micro-broyage d'une poudre afin d'obtenir la granulométrie utilisable. Preferably, said micro-powder of FEP or PEEK used is obtained by evaporation of the aqueous phase solution of FEP or liquid PEEK, then crushed and/or sieved or by micro-grinding of a powder in order to obtain the usable particle size.

Avantageusement, l'étape e) de polymérisation est effectuée à une température entre environ 360°C et 420°C, de préférence environ 380°C, jusqu'à polymérisation totale dudit mélange fluoroéthylènepropylène (FEP) et du polyétheréthercétone (PEEK), soit de préférence pendant 1 heure. En outre, le procédé selon l'invention peut comprendre des étapes préalables de préparation à l'étape a), telle qu'une étape de ressuage thermique et/ou une étape d'épargne et/ou une étape de sablage, au moins partiel, de la surface à revêtir. Advantageously, polymerization step e) is carried out at a temperature between approximately 360°C and 420°C, preferably approximately 380°C, until total polymerization of said fluoroethylenepropylene (FEP) mixture and polyetheretherketone (PEEK), i.e. preferably for 1 hour. In addition, the method according to the invention may comprise preliminary preparation steps in step a), such as a thermal penetrant step and/or a sparing step and/or a sandblasting step, at least partially , of the surface to be coated.

De préférence, le procédé comprend, préalablement à l'étape a), une étape de sablage et/ou une étape de dégraissage, au moins partiel, de la surface métallique à revêtir. Preferably, the method comprises, prior to step a), a sandblasting step and/or a degreasing step, at least partially, of the metal surface to be coated.

L'invention porte également sur un kit de revêtement par un mélange d'au moins un fluoropolymère et d'un polyétheréthercétone (PEEK) d'un substrat ou d'une surface métallique appropriée destinée à recevoir un élastomère tel qu'une gomme de pneu, configuré pour la mise en œuvre d'un procédé tel que décrit précédemment, comprenant : une composition de micro-poudre (50) comprenant un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK), un moyen d'application de ladite composition par projection électrostatique (60) sur ladite surface, de préférence un moyen de polymérisation (70) de ladite composition. The invention also relates to a kit for coating with a mixture of at least one fluoropolymer and a polyetheretherketone (PEEK) of a substrate or a suitable metal surface intended to receive an elastomer such as tire rubber. , configured for the implementation of a process as described above, comprising: a micro-powder composition (50) comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), a means of applying said composition by electrostatic projection (60) onto said surface, preferably a means of polymerization (70) of said composition.

L'invention a également pour objet un substrat ou une surface métallique, comprenant une surface revêtue d'une composition de micro-poudre (50) comprenant un mélange de fluoroéthylènepropylène (FEP) et du polyétheréthercétone (PEEK), obtenu par le procédé défini ci-dessus et destinée à recevoir un élastomère. The invention also relates to a substrate or a metal surface, comprising a surface coated with a micro-powder composition (50) comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), obtained by the process defined below. -above and intended to receive an elastomer.

En outre, l'invention porte sur une composition, de préférence sous la forme de micropoudre, apte à la réalisation du procédé selon l'invention. C'est-à-dire une composition homogène de micro-poudre comprenant au moins du fluoroéthylènepropylène (FEP) et du polyétheréthercétone (PEEK), plus particulièrement un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK), de préférence dans une proportion entre 10% et 90%, préférentiellement entre 20% et 80%, encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de FEP par rapport au poids total de ladite composition et entre 10% et 90%, préférentiellement entre 20% et 80% , encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de PEEK par rapport au poids total de ladite composition. L'objet de la présente demande porte également sur l'utilisation d'une telle composition, de préférence comprenant au moins du fluoroéthylènepropylène (FER) et du polyétheréthercétone (PEEK) sous forme de micro-poudre comme revêtement afin d'obtenir une surface ayant des propriétés d'anti-adhérence, d'anti-frottement, d'inertie chimique, d'isolation électrique, de résistance thermique et/ou de glissement. Furthermore, the invention relates to a composition, preferably in the form of micropowder, suitable for carrying out the process according to the invention. That is to say a homogeneous micro-powder composition comprising at least fluoroethylene propylene (FEP) and polyetheretherketone (PEEK), more particularly a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), preferably in a proportion between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of FEP relative to the total weight of said composition and between 10% and 90% %, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of PEEK relative to the total weight of said composition. The subject of the present application also relates to the use of such a composition, preferably comprising at least fluoroethylenepropylene (FER) and polyetheretherketone (PEEK) in micro-powder form as a coating in order to obtain a surface having anti-adhesion, anti-friction, chemical inertia, electrical insulation, thermal and/or slip resistance properties.

Un autre objet de l'invention consiste en un outillage mécanique comprenant une surface métallique appropriée revêtue de la composition A-B comprenant le mélange d'au moins un fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) obtenu par le procédé tel que décrit précédemment et destinée à recevoir un élastomère tel qu'une gomme de pneu. Another object of the invention consists of a mechanical tool comprising a suitable metallic surface coated with the composition A-B comprising the mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) obtained by the process as described above and intended to receive an elastomer such as tire rubber.

Plus précisément, l'invention porte également sur un outillage mécanique comprenant une surface métallique appropriée revêtue du mélange d'au moins un fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) et destinée à recevoir un élastomère tel qu'une gomme de pneu, comportant les caractéristiques suivantes ensembles ou séparément: une seule couche du mélange d'au moins un fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) est appliquée ; la couche du mélange de micro-poudres d'au moins un fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) appliquée selon une épaisseur comprise entre 3 pm et 20 pm, de préférence comprise entre 5 pm et 15 pm, préférentiellement d'environ 10 pm. le mélange d'au moins un fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) est une composition de micro-poudres comprenant entre 10% et 90%, préférentiellement entre 20% et 80%, encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de fluoroéthylènepropylène (FEP) par rapport au poids total de ladite composition et entre 10% et 90%, préférentiellement entre 20% et 80%, encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de polyétheréthercétone (PEEK) par rapport au poids total de ladite composition. Selon un autre mode de réalisation ladite composition de micro-poudres comprend un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) en proportion à 50/50 en poids par rapport au poids total de ladite composition. More specifically, the invention also relates to mechanical tooling comprising a suitable metallic surface coated with a mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) and intended to receive an elastomer such as tire rubber, comprising the following characteristics together or separately: a single layer of the mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) is applied; the layer of the mixture of micro-powders of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) applied to a thickness of between 3 pm and 20 pm, preferably between 5 pm and 15 pm, preferably around 10 p.m. the mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) is a composition of micro-powders comprising between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, of preferably between 40% and 60% by weight of fluoroethylenepropylene (FEP) relative to the total weight of said composition and between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of polyetheretherketone (PEEK) relative to the total weight of said composition. According to another embodiment, said micropowder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) in a 50/50 proportion by weight relative to the total weight of said composition.

Un tel outil peut être un moule de pneu ou un outil destiné à entrer en contact avec un élastomère tel que par exemple un outil pour découper un élastomère. Such a tool can be a tire mold or a tool intended to come into contact with an elastomer such as for example a tool for cutting an elastomer.

Brève description de la figure Brief description of the figure

Figure 1 illustre un procédé selon une variante de l'invention décrivant les étapes 10 à 80. D'autres caractéristiques, détails et avantages de l'invention ressortiront à la lecture de la description qui suit, en référence à la figure 1. Figure 1 illustrates a method according to a variant of the invention describing steps 10 to 80. Other characteristics, details and advantages of the invention will emerge on reading the description which follows, with reference to Figure 1.

Description détaillée d'un mode de réalisation Detailed description of an embodiment

Selon la représentation de la figure 1, le procédé commence de préférence par une étape (10) de ressuage thermique de la pièce à traiter selon les moyens connus de l'homme du métier dans des conditions opératoires ne dégradant pas le substrat. Cette étape de ressuage thermique permet d'éliminer les impuretés qui pourraient se trouver sur la pièce à traiter et gêner l'adhésion du revêtement selon l'invention. According to the representation in Figure 1, the process preferably begins with a step (10) of thermal penetrating the part to be treated according to means known to those skilled in the art under operating conditions which do not degrade the substrate. This thermal penetrant step makes it possible to eliminate impurities which could be found on the part to be treated and hinder the adhesion of the coating according to the invention.

Avantageusement, une étape (30) de sablage peut être réalisée afin de préparer la surface du substrat. Le sablage est réalisé par tout moyen approprié et notamment par un oxyde d'aluminium cristallisé électro-fondu de très haute pureté, obtenu par fusion d'oxyde d'aluminium calciné ; comme par exemple au moyen de corindon blanc de grade 80. Advantageously, a sandblasting step (30) can be carried out in order to prepare the surface of the substrate. Sandblasting is carried out by any appropriate means and in particular by an electro-fused crystallized aluminum oxide of very high purity, obtained by melting calcined aluminum oxide; such as for example using grade 80 white corundum.

La pression de sablage est ajustée en fonction du substrat de manière à éviter de l'endommager, par exemple entre environ 2 à 3 bars. Pour un substrat métallique, une pression à 3 bars est préférée. Un ou plusieurs passages des moyens de sablage peut être mis en œuvre selon le souhait de l'opérateur en fonction de la nature du substrat et du résultat souhaité. Par la suite, une étape (40) de nettoyage peut être effectuée par exemple par soufflage d'air comprimé sur les surfaces appropriées, afin d'enlever les résidus de corindons et/ou de matières détachées du substrat. The sandblasting pressure is adjusted according to the substrate so as to avoid damaging it, for example between approximately 2 to 3 bars. For a metal substrate, a pressure of 3 bars is preferred. One or more passes of the sandblasting means can be implemented according to the operator's wishes depending on the nature of the substrate and the desired result. Subsequently, a cleaning step (40) can be carried out for example by blowing compressed air onto the appropriate surfaces, in order to remove residues of corundum and/or materials detached from the substrate.

Optionnellement une étape (20) d'épargne peut être ensuite mise en place avant et/ou après l'étape (30) de sablage afin de délimiter la zone de sablage et/ou d'application de la composition selon l'invention sur la surface du substrat. L'épargne peut être mécanique ou manuelle selon les moyens connus de l'homme du métier tels que l'apposition d'un masque sur des parties de surface que l'on ne souhaite pas traiter par exemple à l'aide d'un scotch de sablage. En particulier, les zones qui ne doivent pas être revêtues sont protégées par une telle épargne. Optionally a saving step (20) can then be implemented before and/or after the sandblasting step (30) in order to delimit the zone of sandblasting and/or application of the composition according to the invention on the surface of the substrate. The saving can be mechanical or manual according to means known to those skilled in the art such as affixing a mask to surface parts that one does not wish to treat, for example using tape. sandblasting. In particular, areas that should not be coated are protected by such savings.

Enfin, l'étape (60) d'application de la composition selon l'invention par pulvérisation électrostatique est réalisée à l'aide d'un pistolet électrostatique, à raison d'environ 50g/m2 à 150 g/m2, de préférence environ 100 g/m2. Finally, the step (60) of applying the composition according to the invention by electrostatic spraying is carried out using an electrostatic gun, at a rate of approximately 50g/m2 to 150 g/m2, preferably approximately 100 g/m2.

La composition de micro-poudre selon l'invention aura été préalablement préparée durant l'étape (50) sur la figure 1, par mélange de micro-poudres de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) obtenues par broyage puis tamisage de la matière sèche issue après évaporation de FEP et de PEEK liquide ou par micro-broyage des poudres afin d'obtenir la granulométrie désirée. The micro-powder composition according to the invention will have been previously prepared during step (50) in Figure 1, by mixing micro-powders of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) obtained by grinding then sieving the dry material obtained after evaporation of FEP and liquid PEEK or by micro-grinding of the powders in order to obtain the desired particle size.

Lesdites micro-poudres peuvent être achetées dans le commerce ou bien fabriquées sur place. Cependant, le demandeur a noté, qu'il est très difficile de trouver dans le commerce des micro-poudres ayant la caractéristique notamment la granulométrique, adaptée à la présente invention. Il apparait donc préférable de les produire par soi-même selon le protocole décrit dans la présente demande. Said micro-powders can be purchased commercially or manufactured on site. However, the applicant has noted that it is very difficult to find commercially micro-powders having the characteristic, in particular the particle size, suitable for the present invention. It therefore appears preferable to produce them yourself according to the protocol described in this application.

Ledit mélange de micro-poudres de FEP et PEEK est réalisé dans les proportions suivantes : entre 10% et 90%, préférentiellement entre 20% et 80%, encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de FEP par rapport au poids total de ladite composition et entre 10% et 90%, préférentiellement entre 20% et 80%, encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de PEEK par rapport au poids total de ladite composition. Said mixture of FEP and PEEK micro-powders is produced in the following proportions: between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% in weight of FEP relative to the total weight of said composition and between 10% and 90%, preferably between 20% and 80%, again more preferably between 30 and 70%, preferably between 40% and 60% by weight of PEEK relative to the total weight of said composition.

Selon un autre mode de réalisation ladite composition de micro-poudres comprend un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK) en proportion à 50/50 en poids par rapport au poids total de ladite composition. According to another embodiment, said micropowder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK) in a 50/50 proportion by weight relative to the total weight of said composition.

En outre, la composition selon l'invention peut comprendre d'autres composés pour autant qu'ils ne s'opposent pas à l'application et à la polymérisation de la composition selon l'invention. A titre d'exemple on peut citer : des colorants tels que le graphite, et/ou des agents lubrifiants, et/ou des agents durcissants. In addition, the composition according to the invention may comprise other compounds provided that they do not oppose the application and the polymerization of the composition according to the invention. By way of example, we can cite: dyes such as graphite, and/or lubricating agents, and/or hardening agents.

Finalement, une étape (70) de polymérisation est réalisée à une température adaptée au substrat généralement comprise entre environ 360°C et 420°C, de préférence de préférence entre 360°C et 385°C, plus préférentiellement à environ 380°C, pendant 30 à 90 minutes, de préférence entre 45 et 60 minutes ; préférentiellement 1 heure environ, selon les moyens connus de l'homme du métier comme par exemple en utilisant un four ou un rayonnement infrarouge. Cette cuisson permet de former une couche qui adhère sur tout ou partie de la surface métallique. Finally, a polymerization step (70) is carried out at a temperature adapted to the substrate generally between approximately 360°C and 420°C, preferably preferably between 360°C and 385°C, more preferably at approximately 380°C, for 30 to 90 minutes, preferably between 45 and 60 minutes; preferably approximately 1 hour, according to means known to those skilled in the art such as for example using an oven or infrared radiation. This cooking makes it possible to form a layer which adheres to all or part of the metal surface.

Le substrat ainsi revêtu est par la suite refroidi, par exemple jusqu'à atteindre la température ambiante, puis des contrôles (80) de qualité peuvent être effectués. The substrate thus coated is subsequently cooled, for example until reaching ambient temperature, then quality controls (80) can be carried out.

Lesdits contrôles peuvent consister en des relevés dimensionnels de préférence en plusieurs points de la surface ainsi revêtue. Ces relevés se font par exemple au permascope. Il est ainsi possible de s'assurer de l'épaisseur du revêtement et de son uniformité. On peut aussi vérifier s'il y a des cloques ou des traces d'oxydation. Avantageusement un test de quadrillage sur éprouvette traceuse peut être réalisé. Said checks may consist of dimensional readings preferably at several points of the surface thus coated. These readings are carried out, for example, using a permascope. It is thus possible to ensure the thickness of the coating and its uniformity. We can also check if there are blisters or traces of oxidation. Advantageously, a grid test on a tracer specimen can be carried out.

Dans certains cas, il est préférable de commencer le procédé par une étape de dégraissage alcalin de la surface du substrat avant ladite étape de ressuage thermique (ou pyrolyse). Selon la représentation de la figure 1, le procédé selon une variante de l'invention commence de préférence par une étape (30) de sablage de la pièce à traiter, optionnellement précédée d'une étape d'épargne (20). In certain cases, it is preferable to start the process with an alkaline degreasing step of the surface of the substrate before said thermal penetrant (or pyrolysis) step. According to the representation in Figure 1, the method according to a variant of the invention preferably begins with a step (30) of sandblasting the part to be treated, optionally preceded by a saving step (20).

Ensuite, on effectue de préférence une étape de nettoyage (40) par exemple par soufflage d'air comprimé sur les surfaces appropriées, afin d'enlever les résidus de corindons et/ou de métal. Then, a cleaning step (40) is preferably carried out, for example by blowing compressed air onto the appropriate surfaces, in order to remove corundum and/or metal residues.

Les étapes de sablage (30) et/ou de nettoyage (40) peuvent se faire sous contrôle, par exemple visuel, d'un opérateur. The sandblasting (30) and/or cleaning (40) steps can be carried out under the control, for example visually, of an operator.

Le revêtement selon l'invention est généralement transparent mais des composés peuvent être ajoutés pour en modifier la couleur. The coating according to the invention is generally transparent but compounds can be added to modify the color.

Exemples : Examples:

EXEMPLE 1 : essa nfructueux de recouvrement de pièces métalliques par un mélange FEP et PTFE : EXAMPLE 1: successful attempt to cover metal parts with a FEP and PTFE mixture:

La composition de micro-poudres comprend un mélange de fluoroéthylènepropylène (FEP) à 75% (composé A) et de polytétrafluoroéthylène (PTFE) à 25% (composé B), dénommé ci- après DELTAFLON, n'a pas fourni une bonne adhérence sur le métal selon le test de quadrillage réalisé sur le substrat selon la Norme internationale ISO 2409 :2007 bien connue de l'homme du métier. The micro-powder composition comprises a mixture of 75% fluoroethylenepropylene (FEP) (compound A) and 25% polytetrafluoroethylene (PTFE) (compound B), hereinafter referred to as DELTAFLON, did not provide good adhesion on the metal according to the grid test carried out on the substrate according to the International Standard ISO 2409:2007 well known to those skilled in the art.

En particulier, il a été constaté les inconvénients suivants lors des premiers essais consistant à simplement appliquer du DETAFLON poudre sur les garnitures de roues en acier et les premiers résultats ont été très décevants : In particular, the following disadvantages were noted during the first tests of simply applying DETAFLON powder to the steel wheel linings and the first results were very disappointing:

Problème de décollement du DELTAFLON poudre sur des moules en acier (métal plus dur et donc difficile de faire une bonne accroche). Problem of detachment of DELTAFLON powder from steel molds (harder metal and therefore difficult to get a good grip).

Problème de corrosion sous le revêtement car l'un des composants du DELTAFLON poudre (le PTFE) est microporeux et donc laisse passer l'humidité. Problème d'aspect car le DELTAFLON poudre est lisse et donc donne un aspect brillant au pneu. Corrosion problem under the coating because one of the components of DELTAFLON powder (PTFE) is microporous and therefore allows humidity to pass through. Appearance problem because DELTAFLON powder is smooth and therefore gives a shiny appearance to the tire.

EXEMPLE 2 : modification de l'exemple 1 EXAMPLE 2: modification of example 1

Les essais infructueux décrits dans l'exemple 1, ont conduit les inventeurs à chercher des solutions pour résoudre le problème technique. Ces solutions ont consisté à modifier les étapes suivantes : The unsuccessful tests described in Example 1 led the inventors to seek solutions to resolve the technical problem. These solutions consisted of modifying the following steps:

Modification des paramètres de sablage (taille du grain et pression) dans le but d'améliorer l'adhérence. Modification of sandblasting parameters (grain size and pressure) in order to improve adhesion.

Modification du pourcentage entre les agents A et B dans la composition poudre décrite dans l'exemple 1. Modification of the percentage between agents A and B in the powder composition described in Example 1.

Les tests sont mesurés au moyen du test de quadrillage tel que décrit dans la Norme internationale ISO 2409 :2007 bien connue de l'homme du métier. Cette Norme internationale décrit une méthode d'essai pour l'évaluation de la résistance des revêtements de peinture à être séparés de leurs subjectiles lorsqu'on pratique dans le revêtement un quadrillage par incisions jusqu'au subjectile. La propriété évaluée par cette méthode empirique dépend, entre autres, de l'adhérence de la couche soit à la couche précédente, soit au subjectile. The tests are measured using the grid test as described in the International Standard ISO 2409:2007, well known to those skilled in the art. This International Standard describes a test method for evaluating the resistance of paint coatings to being separated from their substrates when a grid is made in the coating by incisions down to the substrate. The property evaluated by this empirical method depends, among other things, on the adhesion of the layer either to the previous layer or to the substrate.

L'appareillage requis pour ces mesures peut être un outil coupant à lame unique qui convient pourtous types de revêtements appliqués sursubjectiles durs ou tendres. Un outil à plusieurs lames est également utilisable mais ne convient ni aux revêtements épais (» 120 pm) ou durs, ni aux revêtements appliqués sur des subjectiles tendres. The equipment required for these measurements may be a single blade cutting tool which is suitable for all types of coatings applied to hard or soft surfaces. A tool with several blades can also be used but is not suitable for thick (> 120 pm) or hard coatings, nor for coatings applied to soft substrates.

Les évaluations sont effectuées selon une classification en six classes représentées dans le tableau 1 ci-dessous : The evaluations are carried out according to a classification into six classes represented in table 1 below:

Tableau 1 :

Figure imgf000015_0002
Table 1:
Figure imgf000015_0002

Les nombreux essais sur plaques n'ont pas donné des résultats probants comme indiqué dans le tableau 2 ci-dessous : The numerous tests on plates did not give conclusive results as indicated in table 2 below:

Tableau 2

Figure imgf000015_0001
Figure imgf000016_0001
Table 2
Figure imgf000015_0001
Figure imgf000016_0001

EXEMPLE 3 : essai positif pour un mélange selon l'invention EXAMPLE 3: positive test for a mixture according to the invention

La composition de micro-poudres comprend un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK), de préférence entre 70 à 90% poids de FEP et de 10% à 30% poids de PEEK. Après lecture au permascope d'un substrat métallique recouvert d'un revêtement les données suivantes ont été obtenues : The micropowder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), preferably between 70 to 90% by weight of FEP and 10% to 30% by weight of PEEK. After permascope reading of a metal substrate covered with a coating, the following data were obtained:

1. Coefficient de frottement : de 0.08 à 0.2 1. Coefficient of friction: from 0.08 to 0.2

2. Température maximum d'utilisation : 210°C 2. Maximum use temperature: 210°C

3. Epaisseur : 10pm +/-5 im 3. Thickness: 10pm +/-5im

4. Teinte : Dépend du support. 4. Tint: Depends on the support.

Méthode : Permascope Method: Permascope

Contrôle visuel à 100 % : OUI 100% visual inspection: YES

Résultats : Conforme - Les résultats mesurés au moyen du test de quadrillage selon la Norme internationale ISO 2409 :2007 tel que décrit dans l'exemple 2, ont tous donnés un résultat égal à la classe O. Results: Compliant - The results measured using the grid test according to International Standard ISO 2409:2007 as described in Example 2, all gave a result equal to class O.

De nombreuses combinaisons peuvent être envisagées sans sortir du cadre de l'invention ; l'homme de métier choisira l'une ou l'autre en fonction des contraintes économiques, ergonomiques, dimensionnelles ou autres à respecter. L'homme du métier adaptera par exemple les températures aux masses thermiques des pièces. Numerous combinations can be envisaged without departing from the scope of the invention; the skilled person will choose one or the other depending on the economic, ergonomic, dimensional or other constraints to be respected. Those skilled in the art will, for example, adapt the temperatures to the thermal masses of the parts.

Claims

Revendications Claims 1. Procédé de revêtement d'un substrat ou d'une surface métallique destiné à recevoir un élastomère par projection électrostatique comprenant au moins les étapes suivantes : a) la préparation d'une composition A comprenant au moins un fluoroéthylènepropylène (FEP) sous forme de micro-poudre présentant une granulométrie comprise entre 1 et 7 pm ; b) la préparation d'une composition B comprenant au moins un polyétheréthercétone (PEEK) sous forme de micro-poudre présentant une granulométrie comprise entre 2pm et 50pm ; c) mélanger intimement les 2 compositions A et B de manière à former une composition A-B (50) sous forme de poudre fine ; d) appliquer par projection électrostatique (60) le mélange A-B obtenu à l'étape c) sur le substrat ou la surface métallique ; e) polymérisation (70) de ladite composition A-B. 1. Process for coating a substrate or a metal surface intended to receive an elastomer by electrostatic projection comprising at least the following steps: a) the preparation of a composition A comprising at least one fluoroethylenepropylene (FEP) in the form of micro-powder having a particle size between 1 and 7 μm; b) the preparation of a composition B comprising at least one polyetheretherketone (PEEK) in the form of a micropowder having a particle size of between 2pm and 50pm; c) mix the two compositions A and B thoroughly so as to form a composition A-B (50) in the form of a fine powder; d) applying by electrostatic projection (60) the A-B mixture obtained in step c) onto the substrate or the metal surface; e) polymerization (70) of said composition A-B. 2. Procédé selon la revendication 1, caractérisé en ce que ledit substrat ou ladite surface métallique destiné à recevoir un élastomère est en acier. 2. Method according to claim 1, characterized in that said substrate or said metal surface intended to receive an elastomer is made of steel. 3. Procédé selon la revendication 1 ou 2, caractérisé en ce que ladite composition de micro-poudres comprend un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK), de préférence entre 10% et 90%, préférentiellement entre 20% et 80%, encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de FEP par rapport au poids total de ladite composition et entre 10% et 90%, préférentiellement entre 20% et 80%, encore plus préférentiellement entre 30 et 70%, de préférence entre 40% et 60% en poids de PEEK par rapport au poids total de ladite composition. 3. Method according to claim 1 or 2, characterized in that said micro-powder composition comprises a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), preferably between 10% and 90%, preferably between 20% and 80%. %, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of FEP relative to the total weight of said composition and between 10% and 90%, preferably between 20% and 80%, even more preferably between 30 and 70%, preferably between 40% and 60% by weight of PEEK relative to the total weight of said composition. 4. Procédé selon l'une des revendications précédentes, caractérisé en ce l'étape d) d'application de ladite composition est effectuée par pistolage électrostatique. 4. Method according to one of the preceding claims, characterized in that step d) of applying said composition is carried out by electrostatic spraying. 5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'étape e) de polymérisation est effectuée à une température entre environ 360°C et 420°C, de préférence 380°C, jusqu'à polymérisation totale dudit mélange fluoroéthylènepropylène (FEP) et du polyétheréthercétone (PEEK), pendant de préférence 1 heure. 5. Method according to one of the preceding claims, characterized in that step e) of polymerization is carried out at a temperature between approximately 360°C and 420°C, preferably 380°C, until total polymerization of said mixture fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), preferably for 1 hour. 6. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'il comprend, préalablement à l'étape a), une étape de ressuage thermique (10) et/ou une étape d'épargne (20) et/ou une étape de sablage (30), au moins partiel, de la surface à revêtir. 6. Method according to one of the preceding claims, characterized in that it comprises, prior to step a), a thermal penetrant step (10) and/or a saving step (20) and/or a sandblasting step (30), at least partially, of the surface to be coated. 7. Procédé selon l'une des revendications 2 à 6, caractérisé en ce que ladite micropoudre de FEP ou de PEEK utilisée est obtenue par évaporation de la phase aqueuse de FEP ou de PEEK liquide puis broyée et/ou tamisée ou par micro-broyage d'une poudre afin obtenir la granulométrie utilisable. 7. Method according to one of claims 2 to 6, characterized in that said FEP or PEEK micropowder used is obtained by evaporation of the aqueous phase of FEP or liquid PEEK then crushed and/or sieved or by micro-grinding of a powder in order to obtain the usable particle size. 8. Kit de revêtement d'un substrat ou d'une surface métallique destiné à recevoir un élastomère, configuré pour la mise en œuvre d'un procédé selon l'une des revendications 1 à 7, comprenant : 8. Kit for coating a substrate or a metal surface intended to receive an elastomer, configured for the implementation of a method according to one of claims 1 to 7, comprising: - une composition de micro-poudre (50) comprenant un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK),- a micro-powder composition (50) comprising a mixture of fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK), - un moyen d'application de ladite composition par projection électrostatique (60) sur ladite surface, - means for applying said composition by electrostatic projection (60) onto said surface, - de préférence un moyen de polymérisation (70) de ladite composition. - preferably a means of polymerization (70) of said composition. 9. Substrat ou surface métallique comprenant une surface revêtue d'une composition de micro-poudre (50) comprenant un mélange de fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK), obtenu par le procédé selon l'une des revendications 1 à 7. Composition pour revêtement apte à la réalisation du procédé selon l'une des revendications 1 à 7. Utilisation d'une composition selon la revendication 10 comme revêtement afin d'obtenir une surface ayant des propriétés d'anti-adhérence, d'anti-frottement, d'inertie chimique, d'isolation électrique, de résistance thermique et/ou de glissement. Outillage mécanique comprenant une surface métallique appropriée revêtue de la composition selon la revendication 7 comprenant le mélange d'au moins un fluoroéthylènepropylène (FEP) et de polyétheréthercétone (PEEK). 9. Metal substrate or surface comprising a surface coated with a micropowder composition (50) comprising a mixture of fluoroethylenepropylene (FEP) and of polyetheretherketone (PEEK), obtained by the process according to one of claims 1 to 7. Composition for coating suitable for carrying out the process according to one of claims 1 to 7. Use of a composition according to claim 10 as coating in order to obtain a surface having anti-adhesion, anti-friction, chemical inertia, electrical insulation, thermal resistance and/or sliding properties. Mechanical tooling comprising a suitable metal surface coated with the composition according to claim 7 comprising the mixture of at least one fluoroethylenepropylene (FEP) and polyetheretherketone (PEEK).
PCT/EP2023/078029 2022-10-14 2023-10-10 Method for coating, by electrostatic spraying, a metal surface or substrate intended to receive an elastomer, and associated kit and tool WO2024079107A1 (en)

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FR2210568A FR3140780A1 (en) 2022-10-14 2022-10-14 Process for coating a substrate or a metal surface intended to receive an elastomer by electrostatic projection, associated kit and tool
FRFR2210568 2022-10-14

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Citations (7)

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Publication number Priority date Publication date Assignee Title
WO1981001375A1 (en) 1979-11-22 1981-05-28 Glyco Metall Werke Composite material with two or a plurality of layers
US20060110601A1 (en) * 2004-11-19 2006-05-25 Hennessey Craig K Process for applying fluoropolymer powder coating as a primer layer and an overcoat
KR20080110351A (en) * 2007-06-15 2008-12-18 그린닉스주식회사 A coating composition for metal coating and a method for forming a coating film on a metal substrate
CN102504678A (en) * 2011-11-18 2012-06-20 吉林大学 Protection coating for petroleum equipment and construction method thereof
EP2599843A1 (en) * 2011-11-30 2013-06-05 Rhenotherm Kunststoffbeschichtungs GmbH Non-stick coating comprising PEK and/or PEEK
US20130183539A1 (en) * 2011-12-28 2013-07-18 Qiang Guo Multi-layer composite including a fluoropolymer surface and a non-fluorinated polymer transition layer
FR3001901A1 (en) * 2013-02-13 2014-08-15 Fluorotechnique METHOD FOR COATING A METAL SURFACE FOR RECEIVING AN ELASTOMER, KIT AND TOOL THEREFOR

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001375A1 (en) 1979-11-22 1981-05-28 Glyco Metall Werke Composite material with two or a plurality of layers
US20060110601A1 (en) * 2004-11-19 2006-05-25 Hennessey Craig K Process for applying fluoropolymer powder coating as a primer layer and an overcoat
KR20080110351A (en) * 2007-06-15 2008-12-18 그린닉스주식회사 A coating composition for metal coating and a method for forming a coating film on a metal substrate
CN102504678A (en) * 2011-11-18 2012-06-20 吉林大学 Protection coating for petroleum equipment and construction method thereof
EP2599843A1 (en) * 2011-11-30 2013-06-05 Rhenotherm Kunststoffbeschichtungs GmbH Non-stick coating comprising PEK and/or PEEK
US20130183539A1 (en) * 2011-12-28 2013-07-18 Qiang Guo Multi-layer composite including a fluoropolymer surface and a non-fluorinated polymer transition layer
FR3001901A1 (en) * 2013-02-13 2014-08-15 Fluorotechnique METHOD FOR COATING A METAL SURFACE FOR RECEIVING AN ELASTOMER, KIT AND TOOL THEREFOR

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